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Abstract

The driver circuit employs a Vc (5 V) and Vb (1.7 V) supply. A clamp is utilized to maintain the desired driver output up-level. The clamp comprises transistors T1, T2 connected in series between the base of the Darlington output (B) and the supply Vb . This clamp utilizes transistor tracking to maintain the driver up-level output at approximately Vb even with process variation. The circuit also includes an AC clamp and a tri-state control. When the tri-state input is high, the driver functions normally. When the tri-state input is low, the two output devices T3 and T4 are shut off by forcing nodes A and B low. The AC clamp improves performance by limiting and discharging any overshoot which may occur during the rising transition of the driver output.

Country

United States

Language

English (United States)

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Driver Circuit With Controlled Output Up-Level

The driver circuit employs a Vc (5 V) and Vb (1.7 V) supply. A clamp is utilized
to maintain the desired driver output up-level. The clamp comprises transistors
T1, T2 connected in series between the base of the Darlington output (B) and the
supply Vb . This clamp utilizes transistor tracking to maintain the driver up-level
output at approximately Vb even with process variation. The circuit also includes
an AC clamp and a tri-state control. When the tri-state input is high, the driver
functions normally. When the tri-state input is low, the two output devices T3 and
T4 are shut off by forcing nodes A and B low. The AC clamp improves
performance by limiting and discharging any overshoot which may occur during
the rising transition of the driver output.